Return void in zoomBy plumbing to match zoomBy public API

android_webview/glue/java/src/com/android/webview/chromium/WebViewChromium.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package com.android.webview.chromium;
 
 import android.content.Context;
 import android.content.res.Configuration;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
@@ skipping 1430 matching lines @@
                 @Override
                 public Boolean call() {
                     return zoomOut();
                 }
             });
             return ret;
         }
         return mAwContents.zoomOut();
     }
 
+    // TODO(paulmiller) Return void for consistency with AwContents.zoomBy and WebView.zoomBy -
+    // tricky because frameworks WebViewProvider.zoomBy must change simultaneously
     @Override
     public boolean zoomBy(float factor) {
         mFactory.startYourEngines(true);
         // This is an L API and therefore we can enforce stricter threading constraints.
         checkThread();
-        return mAwContents.zoomBy(factor);
+        mAwContents.zoomBy(factor);
+        return true;
     }
 
     @Override
     public void dumpViewHierarchyWithProperties(BufferedWriter out, int level) {
         // Intentional no-op
     }
 
     @Override
     public View findHierarchyView(String className, int hashCode) {
         // Intentional no-op
@@ skipping 736 matching lines @@
         mAwContents.extractSmartClipData(x, y, width, height);
     }
 
     // Implements SmartClipProvider
     @Override
     public void setSmartClipResultHandler(final Handler resultHandler) {
         checkThread();
         mAwContents.setSmartClipResultHandler(resultHandler);
     }
 }